Lightroom saves PSD files larger than needed ? ?

Keep in mind that I am fitting into a large corperate work flow so certain things can not be changed.  Any hep much apreciated!!
Software:
LR5
PS CC
Work flow and how problem presents it self:
-A Jpeg is supplied to be clearcut
-Jpeg is imported into LR
- "edit in CS5"
- Exported as a Photoshop copy (flattend and one layer needed for output)
          - 8 bit
- File size is 35MB
- Open in PS do NOTHING but save as (do not change image size / resolution / etc)
- File size is now 22MB
Why is the LR version of the file larger?  How can I change this?
This Seems trivial but due to the way files are shared etc we are VERY consiouse of file size. 
We cant use TIFF, PNG, DNG etc due to problems with different versions of software etc
Thanks all

Hi 99 Jon,
Thanks for the input. 
I would call my self a advanced LR user,  and know the workflow and ins and outs of LR catalogs very well.  though
I just did a quick test to count out what you have sugested though. 
1)Start with a PSD that has been imported into LR
2) Export it as a PSD copy and DO NOT add it back to the catalog on export
3) Export a second copy of the file and DO add it back into the catalog on export
4) Check the file sizes  -  both files are exactly the same size  (43MB)
          This would show that having it as part of a catalog does not effect the file size
          . . . . ..  but just to check . . . .
5) Open both files in PS and save as WITHG EXACTLY THE SAME SETTINGS USED ON EXPORT
6) check file size (both are now 23.3MB)
7) Import both of these files into a catalog and add meta data etc
8) Check files size (both still 23.3MB
So I would say that fairly well proves that it is not a catalog/meta data issue.
But to add to that . . . .
When have you EVER seen a xmp / side car file that is anywhere near 20mb? ? ? ?
Thanks a bunch for the idea though!  I thought you were onto something for a while there hahahaah

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